A single-phase motor in which the starting capacitor remains connected when the motor runs is called a:

A single-phase motor in which the starting capacitor remains connected when the motor runs is called a:

• A. capacitor-start induction-run motor
• B. permanent-split capacitor motor
• C. split-phase motor
• D. capacitor-start capacitor-run motor

Answer: (B)

In this type of single-phase motor, a capacitor provides the necessary phase shift to create a rotating magnetic field by feeding the auxiliary winding. When that capacitor stays in the circuit at all times—permanently connected during running—the motor is a permanent-split capacitor motor. The running capacitor keeps the phase shift constant, so starting torque is generated and the motor continues to run smoothly without a switch disconnecting the capacitor after startup. Capacitor-start induction-run motors use a large starting capacitor that is disconnected after startup, so the capacitor isn’t kept in during running. Split-phase motors don’t rely on a capacitor for the phase shift at all, and capacitor-start capacitor-run motors involve both start and run capacitors in the circuit, with the starting capacitor typically disengaged after start. The defining feature here is the capacitor remaining connected through the run, which is why this is a permanent-split capacitor motor.

In this type of single-phase motor, a capacitor provides the necessary phase shift to create a rotating magnetic field by feeding the auxiliary winding. When that capacitor stays in the circuit at all times—permanently connected during running—the motor is a permanent-split capacitor motor. The running capacitor keeps the phase shift constant, so starting torque is generated and the motor continues to run smoothly without a switch disconnecting the capacitor after startup.

Capacitor-start induction-run motors use a large starting capacitor that is disconnected after startup, so the capacitor isn’t kept in during running. Split-phase motors don’t rely on a capacitor for the phase shift at all, and capacitor-start capacitor-run motors involve both start and run capacitors in the circuit, with the starting capacitor typically disengaged after start. The defining feature here is the capacitor remaining connected through the run, which is why this is a permanent-split capacitor motor.